mc68hc908qf4 Freescale Semiconductor, Inc, mc68hc908qf4 Datasheet - Page 39

• Manufacturer Part Number: mc68hc908qf4
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

3.3 Functional Description
MC68HC908QF4 — Rev. 1.0
MOTOROLA
INTERNAL
DATA BUS
AIEN
INTERRUPT
LOGIC
READ DDRA
WRITE DDRA
WRITE PTA
READ PTA
COCO
BUS CLOCK
CONVERSION
COMPLETE
Four ADC channels are available for sampling external sources at pins PTA0,
PTA1, PTA4, and PTA5. An analog multiplexer allows the single ADC converter to
select one of the four ADC channels as an ADC voltage input (ADCVIN). ADCVIN
is converted by the successive approximation register-based counters. The ADC
resolution is eight bits. When the conversion is completed, ADC puts the result in
the ADC data register and sets a flag or generates an interrupt.
Figure 3-3
Freescale Semiconductor, Inc.
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RESET
shows a block diagram of the ADC.
Figure 3-3. ADC Block Diagram
ADC DATA REGISTER
Analog-to-Digital Converter (ADC)
GENERATOR
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ADIV[2:0]
CLOCK
ADC
ADC CLOCK
DDRAx
PTAx
ADC VOLTAGE IN
ADCVIN
DISABLE
Analog-to-Digital Converter (ADC)
DISABLE
(1 OF 4 CHANNELS)
CHANNEL
SELECT
ADC CHANNEL x
Functional Description
ADCx
Data Sheet
CH[4:0]
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